function vol(input) {

    let number = input.map(Number); //object

    for (i = 0; i < input.length; i += 3) {
        let x = input[i];
        let y = input[i + 1];
        let z = input[i + 2];

        if (inVolume(x, y, z)) {
            console.log('inside');
        }
        else {
            console.log('outside');
        }
        function inVolume(x, y, z) {
            let x1 = 10, x2 = 50;
            let y1 = 10, y2 = 50;
            let z1 = 10, z2 = 50;

            if (x >= x1 && x <= x2) {
                if (y >= y1 && y <= y2) {
                    if (z >= z1 && z <= z2) {
                        return true;
                    }
                }
            }
            return false;
        }

    }
}
// vol([8,20,22]);
// vol([13.1, 50, 31.5, 50, 80, 50, -5, 18, 43]);
vol([ 50, 80, 50]);